In Water Mill Building Supply is a Hamptons based distributor of building materials to the trade including builders, contractors, architects, designers, and homeowners.  We are a major distributor of lumber, mouldings, trim, windows, doors, paints and stains, and tools.  New York City’s oldest hardware store has a showroom located within our retail store that showcases kitchen and bath fixtures, lighting, lock hardware, architectural hardware, and decorative hardware.

1986, Dennis D’Angelo first opened Water Mill Lumber as a split Hardware Store / Tool Rental Center at its current location, 1110 Montauk Highway, Water Mill. Originally, lumber wasn’t part of the product offering, but it was added a few years later. The Tool Rental Center moved to a separate location just down the road, and the store expanded as a lumber and building material and supplies provider for the Hamptons area.

In 2004, Dennis D’Angelo retired from the business, selling Water Mill Lumber to his sons, Steve and Paul D’Angelo. In 2008, Steve and Paul sold Water Mill Lumber to Trade Supply Group where it became what is now known as Water Mill Building Supply.

2009 brought the addition of a Water Mill showroom for Simon’s Hardware and Bath, which quickly proved to be a success.  Their growing success also brought the addition of Water Mill’s first ever outside sales team.

In 2010 and 2011, a big portion of the main store was renovated, including the Tool Department, Paint Department, Front End and Millwork Showroom.  Product selections and displays were improves, as well as our ability to serve our customers better.

In 2013, we expanded our outside sales team to improve service and communication with our customers.

We’ve recently had a big social and technological change – the launching of our mobile app, along with a new and improved website that allows you to place orders from your desktop or mobile device.  Today, Water Mill Building Supply works vigorously to complete the newly renovated main store and showroom.

Water Mill Building Supply offers only the highest quality products.  Our Engineered I-Beams are the leader in the industry.  We stock Boise BCI I-Beams and offer a full line of LVL’s and Power Beams.  We also stock a complete line of Versa 0 Lam engineered framing lumber and a premium grade Douglas fir, the highest grade quality lumber available. This lumber is culled and separated from the rest of the mill and shipped directly to Water Mill Building Supply.  We offer the best and most detailed blueprint takeoff in the industry, and we supply all our builder’s graphically engineered detailed floor by floor layouts with a complete cut list.


Millwork at Water Mill Building Supply

Water Mill Building Supply’s millwork range contains mouldings, windows, and doors that are especially suited to the unique tastes of the Hamptons and Long Island’s east end. New builds or home renovations, we have an experienced team and the capacity to fulfill every need of your project. Tools, supplies, and accessories are also available in our retail store. Those wanting to browse are encouraged to visit our extensive showroom located on Montauk highway halfway between Southampton and Bridgehampton. 


Architectural Windows 

We are distributors of fine custom windows from renowned manufacturers such as Marvin, Western Window Systems, Parrett, Sierra Pacific, Arcadia Custom, Panda & Reynaers.  Contemporary or traditional, made-to-order, or standard sizes, Water Mill Building Supply has the experience, relationships, size and scale to procure and deliver beautifully crafted windows to the build site.  Made-to-order are a specialty, with lead times that rarely exceed custom sizes.  Made-to-order also allows full customization to incorporate individual tastes and styles for all your window needs.  Those wanting to browse are encouraged to visit our extensive showroom and connect with our sales support team that provide the Hamptons with quality products, superior service and satisfaction.


Simon’s Hardware and Bath at Water Mill

Simon’s Hardware and Bath is New York City’s oldest premier specialty hardware and plumbing retailer, a one-stop-shop for contractors, architects, designers, and homeowners.  We have partnered with exceptional companies such as Dornbracht, Rohl, Franke, California Faucets, Omnia, Baldwin Hardware, and many more.  A part of Trade Supply Group, Simon’s has expanded their geographic footprint with a second location in SoHo and a third at none other than Water Mill Building Supply.  With help of Simon’s, Water Mill Building Supply has grown into a one-stop-shop for building materials, supplies, and hardware.